package usb;
import java.util.Scanner;

public class Test04 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num =1;
        int add=0;
        while (true){
            add+=num;
            num++;
            if (add>95){
                break;
            }
        }
        System.out.println(num);
    }
}
